Sources say

Big media is incredible!

[T]hey continue to violate their own guidelines over and over by indiscriminately using anonymity in the most reckless ways. And they know they do it, because it's been repeatedly documented, even by their own ombudsmen and reporters. Yet they blithely continue. What other conclusion could a rational person reach other than that the publishers, editors and reporters of these newspapers neither care about nor deserve journalistic credibility? Just think about it: in the aftermath of the Iraq debacle, they announced: We know we have lost credibility and here are rules we will follow to win back that credibility, only for them to then systematically and continuously breach those rules over and over, thus replicating exactly the behavior that led to the loss of credibility in the first place.

Or, if you prefer, uncredible.